My understanding is that many investors do not look at intraday charts because they mostly look at the market close.

What about postion traders? Do they need intraday charts?

Also, can I assume that swing traders must have intraday charts?

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I only know a handful of position traders and none of them use intraday charts for their trade decisions. Yet, that doesn't imply position traders I don't know aren't going to be using intraday charts to make trade decisions.